Adaptor Circuit for Power Supply

1. An adaptor circuit for a power supply comprising: a power connector adapted for coupling to an Advanced Technology Extended (ATX) power supply, the power connector comprising a power good pin and a power pin; a first electric switch having a first terminal connected to the power good pin of the power connector, a second terminal connected to the power pin of the power connector via a first resistor, and a grounded third terminal; a second electric switch having a first terminal connected to the second terminal of the first electric switch, a second terminal connected to a first voltage terminal via a first transmission line or a second voltage terminal via a second transmission line by selectively mounting a connection component to close an open segment of the corresponding transmission line according to a specification of chipsets on a motherboard, and a grounded third terminal; and an output terminal connected to the second terminal of the second electric switch to provide a voltage signal according to the specification of the chipsets to the chipsets on the motherboard as a driving voltage signal.

2. The adaptor circuit as claimed in claim 1 , wherein the connection component is a resistor.

3. The adaptor circuit as claimed in claim 1 , wherein the first electric switch and the second electric switch are NPN transistors, the first, second, and third terminals are base, collector, and emitter respectively.

4. The adaptor circuit as claimed in claim 1 , wherein the power pin of the power connector is a 5V power pin.

5. The adaptor circuit as claimed in claim 1 , wherein the first voltage terminal is a 3.3V-SYS terminal of the ATX power supply, and the second voltage terminal is a 5V-SYS terminal of the ATX power supply.

6. The adaptor circuit as claimed in claim 1 , wherein the first terminal of the first electric switch is connected to the power good pin via a second resistor.

7. The adaptor circuit as claimed in claim 1 , wherein the second terminal of the second electric switch is grounded via a capacitor.

8. The adaptor circuit as claimed in claim 1 , further comprising a third electric switch, the power connector further comprising a power supply on pin, the third electric switch having a first terminal connected to the power supply on pin of the power connector, a second terminal connected to the output terminal, and a grounded third terminal.

9. The adaptor circuit as claimed in claim 8 , wherein the third electric switch is an NPN transistor, the first, second, and third terminals are the base, the collector, and the emitter of the NPN transistor respectively.

10. The adaptor circuit as claimed in claim 9 , wherein the first terminal of the third electric switch is connected to the power supply on pin via a third resistor.